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Integrated process for the production of vinyl acetate from acetic acid via ethylene

a technology of acetic acid and integrated process, which is applied in the direction of physical/chemical process catalyst, metal/metal-oxide/metal-hydroxide catalyst, organic chemistry, etc., can solve the problems of unsuitability in industrial production, achieve high selectivity and yield, and produce vam economically.

Inactive Publication Date: 2010-12-21
CELANESE INT CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a process for producing a chemical called VAM using ethylene and acetic acid. The process involves a two-stage process where ethylene is first produced from acetic acid, and then reacted with additional acetic acid to form VAM. The process has high selectivity and yield, allowing for economical production of VAM using only acetic acid as a feedstock. The patent also describes a hydrogenation and dehydration process to produce ethylene, which can then be reacted with acetic acid to form VAM. Overall, the patent provides a technical solution for producing VAM on an industrial scale.

Problems solved by technology

Although there are no known preferred processes for such a conversion, the prior art does provide certain processes for such a conversion of acetic acid to ethylene albeit at low conversions and yields thus making it industrially unsuitable.

Method used

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  • Integrated process for the production of vinyl acetate from acetic acid via ethylene
  • Integrated process for the production of vinyl acetate from acetic acid via ethylene
  • Integrated process for the production of vinyl acetate from acetic acid via ethylene

Examples

Experimental program
Comparison scheme
Effect test

example a

Preparation of 5 Weight Percent Copper on Iron Oxide

[0076]Powdered and meshed iron oxide (95 g) of uniform particle size distribution of about 0.2 mm was dried at 120° C. in an oven under nitrogen atmosphere overnight and then cooled to room temperature. To this was added a solution of copper nitrate (17 g) in distilled water (100 ml). The resulting slurry was dried in an oven gradually heated to 110° C. (>2 hours, 10° C. / min.). The impregnated catalyst mixture was then calcined at 500° C. (6 hours, 1° C. / min).

example b

Preparation of H-Mordenite Zeolite

[0077]H-Mordenite zeolite was prepared by calcination of ammonium form Mordenite at 500-550° C. for 4-8 hours. If the sodium form of Mordenite is used as a precursor, the sodium Mordenite is ion-exchanged to ammonium form prior to calcination.

example c

Preparation of 5 Weight Percent Cobalt on H-ZSM-5

[0078]Example A is substantially repeated with the exception of using appropriate amount of cobalt nitrate hexahydrate as the metal salt and H-ZSM-5 as the support catalyst to prepare 5 weight percent cobalt supported on H-ZSM-5.

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Abstract

This invention provides an integrated two stage economical process for the production of vinyl acetate monomer (VAM) from acetic acid in the vapor phase. First, acetic acid is selectively hydrogenated over a hydrogenating catalyst composition to form ethylene either in a single reactor zone or in a dual rector zone wherein the intermediate hydrogenated products are either dehydrated and / or cracked to form ethylene. In a subsequent second stage so formed ethylene is reacted with molecular oxygen and acetic acid over a suitable catalyst to form VAM. In an embodiment of this invention reaction of acetic acid and hydrogen over a hydrogenation catalyst and subsequent reaction over a dehydration catalyst selectively produces ethylene, which is further mixed with acetic acid and molecular oxygen and reacted over a supported palladium / gold / potassium catalyst.

Description

FIELD OF THE INVENTION[0001]The present invention relates generally to an integrated process for the production of vinyl acetate monomer (VAM) from the reaction of acetic acid and ethylene. More specifically, the present invention relates to an integrated process in which acetic acid is converted to ethylene in a first reaction zone with the ethylene further reacted with additional acetic acid in another reaction zone to form VAM. The present invention also relates to an integrated process including hydrogenating acetic acid utilizing a first catalyst composition in a first reaction zone and dehydrating or cracking hydrogenated intermediates with a second catalyst in a second reaction zone to form ethylene. The ethylene from the second reaction zone is reacted with additional acetic acid in a third reaction zone to produce VAM.BACKGROUND[0002]There is a long felt need for an economically viable process to manufacture VAM from acetic acid without utilizing independently sourced ethyl...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C07C67/00C07C67/05
CPCC07C29/149C07C67/00C07C67/055C07C31/08C07C69/14C07C69/01C07C69/15Y02P20/10C07C67/05B01J23/72B01J29/46
Inventor JOHNSTON, VICTOR J.CHEN, LAIYUANZINK, JAMES H.CHAPMAN, JOSEFINA T.KIMMICH, BARBARA F.REPMAN, DEBORAH R.
Owner CELANESE INT CORP
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